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我想更新xml节点并搜索该站点以找到this link处的示例。但是,我得到的对象引用错误未设置为对象的实例。有人会告诉我如何获得节点。在此先感谢无法获取特定XML节点
这是我的VB代码:
Imports System.Xml
Imports System.IO
Partial Class test2
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim xmlFileNamae As String = "Vancouver.xml"
Dim xmlFilePath As String = ConfigurationManager.AppSettings("XMLFolder") & xmlFileNamae
If File.Exists(xmlFilePath) Then
Dim docXML As XmlDocument = New XmlDocument
docXML.Load(xmlFilePath)
Dim ID As String = "1"
Dim node As XmlNode = docXML.SelectSingleNode("/Orders/Order[@ID='" & ID & "']/Date")
node.InnerText = Date.Now
node = docXML.SelectSingleNode("/Orders/Order[@ID='" & ID & "']/Country")
node.InnerText = "Vancouver"
docXML.Save(xmlFilePath)
End If
End Sub
End Class
还有就是我的xml文件:
<?xml version="1.0" encoding="utf-8"?>
<Orders>
<order ID="2">
<item>Organ</item>
<Date>7/24/2014 3:50:42 PM</Date>
<Country>China</Country>
</Order>
<order ID="1">
<item>Apple</item>
<Date>7/24/2014 3:50:42 PM</Date>
<Country>China</Country>
</order>
</Orders>
哪一行引起错误? – Fabio
你能详细说明错误在哪一行被抛出吗?在第一眼看来,我认为'xmlFilePath'没有很好地初始化'&xmlFileNamae',它可能被错写了,这会导致'.Load()'抛出错误。 –
@Nadeem_MK,它抛出这一行Dim node As XmlNode = docXML.SelectSingleNode(“/ Files/File [@ ID ='”&ID&“']/Date”)。节点没有什么 – user819774